Unit 2 Understanding each other单元提能强化练习题 2022-2023学年高中英语译林版选择性必修第四册

Unit 2　Understanding each other单元提能强化练习题 Ⅰ.阅读理解 A When homework and tests keep you up late at night,you may plan to make up for your lost sleep during the weekends.But is it useful? A study published in the journal Current Biology shows that the habit of sleeping in on weekends doesn’t fix the damage that has been done by a lack of sleep during the week.Even worse,it may damage your health. In the study,which was conducted over 10 days,36 healthy young men and women with different sleep requirements were divided into three groups.The first group were asked to sleep nine hours a night and the second group five hours a night.The members of the third group slept for five hours on weekdays but rested as long as they wanted on the weekend. The researchers found that people who lacked sleep ate more snacks and gained weight quickly.However,this wasn’t the case for the first group. That could be partially due to the shifting of the biological clock and changes to certain body hormones,especially hunger hormones.In order to catch up on their sleep during weekends,people in the third group would eat later as a habit.So their biological clocks shifted,which also changed the production of hunger hormones. “The hormone leptin(瘦素) decreases appetite(胃口),while the hormone ghrelin(胃饥饿素) increases appetite,” explained US researcher Vsevolod Polotsky.“Sleep shortage causes the leptin to drop and the ghrelin to rise,so you’re hungry and eat more.” And even if they tried to sleep for as long as they wanted to during weekends,according to researchers,it was still not enough because they found it difficult to fall asleep. Moreover,short and insufficient sleep schedules will lead to an inability to change blood sugar and increase the risk of metabolic(新陈代谢) disease in the long term. 1.What do we know about the study? A.Participants were divided into two groups. B.Researchers studied 36 children and adults. C.It lasted for more than two weeks. D.Each group follow different sleep require